Issued in 1972, this French duo promotes the use of postal codes — “code postal” — to improve mail sorting efficiency. The modernist design by Jean Picart Le Doux features a stylized hand launching a sequence of colored dots symbolizing streamlined mail delivery. The vivid green and red backgrounds emphasize clarity and motion, reflecting France’s modernization of its postal services in the 1970s. These stamps form part of an educational campaign set that became iconic for its minimalist graphic style.